Lock for sliding doors.



A. W.JOHNSON.

LOCK FOR SLIDING DOORS.

APPLICATION FILED JUNE 28, l9l7.

mwmn Patented Feb.12,1918.

ALBERTW. JOHNSON, 0]! 30800, MINNESOTA.

LOCK FOR SLIDING DOORS.

Specification of Letters Patent.

Patented Feb. 12, 1218.

Application filed June 28, 1917. Serial No. 177,559.

To all whom it may concern:

Be it known that I, ALBERT W. JOHNSON, citizen of the United States, residing at Josco, in the county of WVaseca, State of Minnesota, have invented certain new and useful Improvements in Looks for Sliding Doors; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in looks for sliding doors, and has for its primary object to provide means by which a sliding door may be locked against operation.

A further object of the invention is to provide a device of this character in which the lock is automatically set upon the closing of the door.

Referring to the drawings,

Figure 1, is a perspective View showing the method of mounting the lock and the door,

Fig. 2, is a detail View of the lock with one of the side plates removed,

Fig. 3, is a detail view of portion of the lock, and,

Fig. 4, is a view showing the method of operation.

Referring more particularly to the drawings, the reference character 16 designates a door, and secured thereto is a keeper 11 which is provided with angular faces 12 and 13 which terminate in a point 1 1.

Carried by the door casing is a lock 15 and referring to Fig. 2, it will be seen that said lock comprises a housing in which is pivotally mounted a latch or the like 16, the reference character 17 designating the pivotal point of said latch. This latch is substantially crescent shaped and is provided on its inner curved face with a shoulder 18 the purpose of which will be hereinafter described, and projecting from said crescent shaped member near its bottom end is a lug 19 which is adapted to engage a spring 20 which in turn is rigidly carried by the housing of the lock. The latch 16 is further provided with a projecting lug 21, and pivotally secured to said lug 21 is an operating lever 22 which is provided with handles 23.

As shown in Fig. 3, this lever 22 is substantially Tshaped, and comprises a body portion 24 from which projects in opposite direction the arms 25 which latter are pro vided with perforations 26 arranged in substantially equidistantly spaced relation. The body portion 24E of this member is extended as at 27 to provide a guide therefor, and the oppositely projecting members 25 are adapted to project through the sides of the casing 15.

From the foregoing it will be seen that as the sliding door is closed the keeper member 11 will engage the shoulder 18 to move the crescent member 16 to the dotted line position shown in Fig. 4 whereupon the upper end 80 of said crescent member will engage behind the projecting portion 1 1 in contact with the inclined face 12 of the keeper member 11. This movement of the latch 16 about its pivot moves the crescent shaped member to a point where its lug 19 will be engaged by the end of the spring 20, which construction prevents the crescent shaped member 16 from being rocked on its pivot 17 by pulling upon the door. If however, it is desired to release the door, one of the handles 23 is grasped and the lever 24 is reciprocated which action rocks the crescent shaped member 16 on its pivot 17 until its hooked end 30 disengages the projecting portion 1 1 of the keeper 11 whereupon the door is free to be moved to the open position.

In view of the foregoing it is apparent that the present invention provides a lock or latch for sliding doors which is adapted to be moved to the locked position by means of the door moving to its closed position, and which is retained in said locked position in such a manner as to prevent operation thereof by means of the sliding door.

Having thus described the invention, what is claimed, is:

A device of the character described comprising in combination, a casing, a substantially crescent shaped member pivotally mounted in the casing, a keeper slidable of the casing and adapted to rock the crescent shaped member upon its pivot to engage In testimony Where0f,I aflixr my signature said keeper, and means pivotally connected in the presence of two witnesses;

to the crescent shaped member and slidable r ALBERT W. JOHNSON. longitudinally thereof for rocking the cres- Witnesses: cent shaped member into and out of en- J. OLSEN,

gagement with said 'keeper. AnOLPH OLSEN.

Gopies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. r i 

